XML Naming Scheme – Can I Change it from Date to Specific Number of URL’s?

Great plugin! I for one, however would rather have the xml files not named and broken up by month, but rather by a maximum number of urls for each file. Simply setting a number, say 1500 per XML file would suffice. I believe that having every month and year in perpetude could affect search rankings and also, definitely create an excessive number of files in the total structure particularly for a seasoned site.

Is it possible to have an option to change it between the current date, year naming scheme to a more simple maximum number per archive scenario?